Man greeting Man – Firm handshakes with the right hand are the most common form of greeting.  They are usually not to prolonged.  Many people use a two handed handshake when greeting and departing

Woman greeting Woman- Two kisses on the cheek if they are acquainted, but if not, a gentle handshake using both hands, or just a slight nod of acknowledgment will do

Greetings between Men & Women - While handshakes are a common form of greeting, many times a simple nod or slight bow will do as many men and women generally do not engage in physical contact.  To be sure, let the woman offer her hand first.

Note: It is taboo for religiously observant men to touch women and vice-versa.